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The degree of reduction of the acceptor yA is (by definition) a negative number. Using equations 8a-8c, it is also possible to calculate directly YDX, YAX, and YqX as function of Ygx. If we further use the found energetic regularity that DGex ^ DGed (equation 7a) and replace (DGed — DGEA) by ( —DGCAT)/yD using equation 6a, it is possible to derive the simple equations 9b-9e. It is noted that DGCAT is the Gibbs energy of the catabolic reaction of 1 C-mol organic or 1 mol inorganic compound, and that therefore ( — DGCAT) is the Gibbs energy released in the catabolic reaction of 1 C-mol of organic or 1 mol of inorganic electron donor. ( —DGCAT) is then by definition >0 and its units are kJ/(C)-mol donor. DGCAT and DHCAT follow from equations 6a and 6b using DGea and DGed values (Tables 3 and 5).

1/YG

Furthermore it is often interesting to study YDA, which is the amount of electron acceptor couple consumed relative to the amount of electron donor consumed. For microorganisms growing aerobically on organic matter, this would be the mole of O2 consumed per C-mole of organic compound consumed. For anaerobic growth this would be the amount of anaerobic products per amount of organic substrate in C-mole product per C-mole substrate. Because Yda = Ydx/Yax we obtain yda — [Vd/(-Va)]

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